text: from .electrolyte_base_Landesfeind2019 import electrolyte_TDF_base_Landesfeind2019
  import numpy as np
  
  
  def electrolyte_TDF_EMC_FEC_19_1_Landesfeind2019(c_e, T):
      """
      Thermodyamic factor (TDF) of LiPF6 in EMC:FEC (19:1 w:w) as a function of ion
      concentration and temperature. The data comes from [1].
  
      References
      ----------
      .. [1] Landesfeind, J. and Gasteiger, H.A., 2019. Temperature and Concentration
      Dependence of the Ionic Transport Properties of Lithium-Ion Battery Electrolytes.
      Journal of The Electrochemical Society, 166(14), pp.A3079-A3097.
  
      Parameters
      ----------
      c_e: :class:`pybamm.Symbol`
          Dimensional electrolyte concentration
      T: :class:`pybamm.Symbol`
          Dimensional temperature
  
      Returns
      -------
      :class:`pybamm.Symbol`
          Electrolyte thermodynamic factor
      """
      coeffs = np.array(
          [3.22, -1.01e1, -1.58e-2, 6.12, 2.96e-2, 2.42e-5, -2.22e-1, -1.57e-2, 6.30e-6]
      )
  
      return electrolyte_TDF_base_Landesfeind2019(c_e, T, coeffs)
  